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Issue 47, 2009
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Systematic investigation of an array of TCNQ lanthanide complexes: synthesis, structure and magnetic properties

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Abstract

An array of TCNQ (TCNQ = 7,7,8,8-tetracyano-p-quinodimethane) lanthanide complexes, namely, [Ln2(TCNQ)4(H2O)10(EtOH)2][2TCNQ]·xH2O [Ln = La (1, x = 5), Pr (2, x = 3)], [Ln2(TCNQ)4(H2O)10][2TCNQ]·yH2O [Ln = Gd (3, y = 6), Dy (4, y = 5)] and [Ln(TCNQ)2(H2O)6][TCNQ]·H2O·MeOH [Ln = Er (5), Lu (6)], have been synthesized by salt-elimination reactions. X-ray crystallographic analysis indicates that 1–6 are discrete ion complexes. Cations of 1–4 adopt a dimer structure, while cations of 5 and 6 display a monomer structure. The magnetic study proposes that an antiferromagnetic interaction between TCNQ radicals exists in 1–6. The depopulation of the Stark levels for 2 and 5 leads to a continuous decrease in χmT when the samples are cooled from 300 K to 2 K. The desolvated 3, namely, 3a exhibits a unique magnetic conversion from the magnetic disordering to the magnetic ordering at 4 K. 4 shows a ferromagnetic coupling between paramagnetic centers.

Graphical abstract: Systematic investigation of an array of TCNQ lanthanide complexes: synthesis, structure and magnetic properties

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Publication details

The article was received on 11 May 2009, accepted on 25 Sep 2009 and first published on 29 Oct 2009


Article type: Paper
DOI: 10.1039/B909213G
Dalton Trans., 2009, 10466-10473

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    Systematic investigation of an array of TCNQ lanthanide complexes: synthesis, structure and magnetic properties

    J. Zhang, P. Yan, G. Li, G. Hou, M. Suda and Y. Einaga, Dalton Trans., 2009, 10466
    DOI: 10.1039/B909213G

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